Shih CJ, Lai MC. Analysis of the AAA+ chaperone clpB gene and stress-response expression in the halophilic methanogenic archaeon Methanohalophilus portucalensis. Microbiology (Reading). 2007 Aug;153(Pt 8):2572–83. doi: 10.1099/mic.0.2007/007633-0. PMID: 17660421.